Cover your tracks in Firefox
HistoryBlock is a Firefox add-on that enables you to block selected domains from being included in your history tab, the recently closed tabs list, and the Firefox download manager. The program can be used to keep visits to certain private without having to erase your history or starting a Private Browsing session. If privacy is not an issue, you can use HistoryBlock to keep your history items less cluttered with irrelevant sites.
You can blacklist a site from the Firefox right-click menu or you can add the domain manually from the extension manager. HistoryBlock does not disclose the list of sites that you have blacklisted as this would obviously defeat the purpose to some degree.You could achieve the same result by using
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